With a view toward producing garnets with magnetic ions in only the dodecahedral and octahedral sites (see Refs. 1 and 2), we have attempted to synthesize, at atmospheric pressure, the garnets Mn3Fe2(SiO4)3* and Mn3Cr2(SiO4)3 by means similar to those used to synthesize spessartite (4, 5) and uvarovite (6, 7). The latter are the only two silicate garnets which, to date, have been rather directly synthesized. In these experiments, garnets were not produced. We usually obtained spinel-type structures; in some cases, MnSiO3 (rhodonite) was obtained. Also, in some cases, the devitrification of the silica to tridymite occurred.

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